diff --git a/sources/interpolations.F90 b/sources/interpolations.F90
index 3a4c406..3aef5f1 100644
--- a/sources/interpolations.F90
+++ b/sources/interpolations.F90
@@ -126,7 +126,7 @@ module interpolations
 ! flags for reconstruction corrections
 !
   logical     , save :: mlp        = .false.
-  logical     , save :: positivity = .false.
+  logical     , save :: positivity = .true.
   logical     , save :: clip       = .false.
 
 ! interpolation coefficients
@@ -208,7 +208,7 @@ module interpolations
     character(len=255) :: plimiter        = "mm"
     character(len=255) :: climiter        = "mm"
     character(len=255) :: mlp_limiting    = "off"
-    character(len=255) :: positivity_fix  = "off"
+    character(len=255) :: positivity_fix  = "on"
     character(len=255) :: clip_extrema    = "off"
     character(len= 16) :: stmp
     real(kind=8)       :: cfl             = 0.5d+00